Telephone



Patented Dec. 22, 1925.

UNITED STA res NORMAN WILLIAM MIoLACI-ILAN' OF BOCHESTIE IRJGREAT LEIGHS, CHELMSFORD, ENG- LAND, ASSIGNOR T RADIO CORPORATION OF AMERICA, A CORPORATION OF DELA- WARE.

TELEPHONE.

Application filed August 13, 1923. Serial, No; 657,098.

To all whom it may concern:

Be it known that I, NORMAN WILLIAM MCLACHLAN, asubject of the King of Great Britain, and resident of Rochester, Great L'eighs, Chelmsford, England, have invented.

certain new and useful Improvements in Telephones, of which the'following is a specification accompanied by drawings.

an improved loud speaking telephone. 7

reed or armature is mounted on a torsion spindle or wire between the poles of a' magnet, which poles may be of channel or trough I5 shape and in the recesses of which are two coils so arranged that the fields due to them are .in the same direction, and one side of the reed is fixed to the middle of a idiaphragm of mica or other suitable material which is securely clamped around its periphery.

My invention is illustrated by the accompanying drawing, in .rhich- Fig. 1 is a vertical cross section and Fig. 2 is'a plan view of an instrument constructed in accordance therewith.

A is a diaphragm of mica the periphe of which is securely'held between a rm and an annular support C carried by a asev 20 D. The middle of the diaphragm is con nected by a rod E to a soft iron reed F attached to a torsion spindle G and lying be tween the-"poles of a horse shoe magnet H which is mounted in a bearing J so that it can be adjusted by means of a nut K and spring The poles of the magnetare of channel or trough shape and in them are coils M, M, so arranged that the fields due to themare in the same direction. The magnet is adjusted by means of the nut K so that the reed "is in a magnetically symmetrical position, a hole N being provided in the sides of the oil mounting spools to permit this adj ustn ent. If a'current be passed through the coils the reed will move about the axis of the spindle G and consequently the diaphragm will be caused to vibrate in accord-' ancewith the variations of the current.

Having described my invention what I claim is: I

' 1. A telephone comprising a soft iron reed so mounted that it can turn between the poles of a rotatably mounted magnet, which poles According to this invention a soft iron contain coils through which a current can be passed, and a diaphragm connected to the reed.

2A telephone comprising a rotatably mounted magnet, a rotatably mounted armature between air gaps in the magnet, a coil for effecting the armature, means for adjusting the angular relation between the The object of this invention is toprovide magnet and thearmature and a resonator connected to the armature. V

A telephone comprising a ivoted magnot, a concentrically pivoted ar ature in the air gap of the magnet, a coil surrounding-the armature having its axis transverse to the direction of the air gap and a p diaphragm connected to the armature.

4. A telephone comprising a pivoted magnet, a concentrically pivoted armature in the air gap of the magnet a coil surrounding the armature located etween the poles of the ma net, said coil having its axis trans'- verse to t 1e direction of theair gap and a diaphragm connected to the armature.

5. telephone comprising a pivoted permanent magnet, a concentrically pivoted soft ironfarmature in the air gap of the magnet,

a coil surrounding the armature having its axis transverse to the direction'of the air gap and a diaphragm connected to the armature.

6. telephone comprising a magnet hay mg air gaps, a pivoted armature in the air gaps of the magnet, a coil surrounding the armature in a line joining the poles of the magnet, the axis of the coil and the axisot the armature being arranged to intersect at substantially right angles to each other, means for rotata-bly adjusting the position oi the air gaps and a diaphragm connected to the armature.

7. A telephone comprising a magnet having an} air gap and channel pole pier -s, a coil filling the space in the channel pole pieces, an' armature extending therethrou h substaptially parallel with the axis of tie coil, "said armature beingmounted on a tor sionrs'pindle extending substantially in a di'- 'rection atright angles to the direction of I mature extending longitndinelly through a hole between the coilsr and ediephragm conparallel thereto.

nected to the armature.

9. A telephone comprising a magnet, a die hragm, apivoted armature connected to sgii diaphragm anddisposed in a position magnetically symmetrical to the field offsaid,

em diaphragm, adjusting means for locating said armature in a position magnetically 'sfimmetriczil to the field of said magnet rough rotation of said nagnet and a 'coil surrounding the armature andhavingdts axis parallel to the armature.

I 11. In combination a magnet, having-channeled polepieces, coil structure having a plurality of openings, fitted between the pole pieces, an armature having a torsion spintile' passing through the openings.

12. In combination, ama net hevingchzin- .neled pole pieces, coil spoo s having gi ooves in their ends fitted between normal members of both channeled pole pieces so. that their grooves form a hole.

13. In coinbinxition, a ma gnet having chenholed pole pieces, coil spools fitted in the pole pieces; in armature eiiectedby the coil andineans for adjusting the angular relation between the magnet-and the armature without changing the tension of the arrnatur'e.

N ORMAN WILLIAM MoLAGI-ILAN. 

